Challenge

Week 6 - Creating connection for Rear door

Aim :

To obtain rear door connection of an automobile with different types of connection methods.

Procedure :

1. Import the model to ANSA.

2. Set PID for each element as shown in Fig 1.1 & 1.2

Fig : 1.1 Fig 1.2

3. Wherever Bolts are used, create a COG point and convert to bolt. Using Connection Manager connect the elements.

Fig : 2

4. At the hinge portion, create RBE2 with 2 nodes and remove degree of freedom for Z-axis rotation (i.e., maintain 12345 only)

Fig : 3

5. Elements connecting with weld needs to be connected with a Spot Weld point. Create a 3D point using COG option and convert to Spot Weld point.

Using connection manager create a spot weld with RBE3-HEXA-RBE3.

Fig : 4.1 Fig : 4.2

6. Create many nodes RBE2 for handle and apply CONMi>CONM2>NODES at COG point. Apply mass in Tonnes (1e-4).

+

Fig : 5

7. Windows need to be connected with C-Bush. Create curves around the perimeter of the glass. Convert the curves into spot lines (Fig : 6.1).

Using connection manager, select RBE3-CBUSH-RBE3 to represent the connection of window (Fig : 6.2).

Fig : 6.1 Fig : 6.2

8. Complete C-Bush connections for all the sides as shown in the fig below.

Fig : 7

Learning :

  • Concept of Connection.
  • Types of Connections (Bolt, Weld, C-Bush, CON mass, etc.)
  • Degree of freedom for hinge connections.
  • NASTRAN Module.

Outcome :

Rear door connections are completed using Bolt, Spot Weld & C-Bush connection options.

C-bush is applied for window connections for soft bending and shock absorption.

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